Artemis II and Moon Habitats: Radiation, Regolith, and the Road to Space Settlement

Artemis II is a crewed test flight around the Moon, with Libby Jackson explaining how the mission is used to validate Orion and the SLS rocket ahead of future lunar landings, and how Artemis as a program blends science, technology, and geopolitics. The discussion turns to what a long-term lunar presence could look like, from hiding habitats in lava tubes to shielding bases with regolith, and the health risks astronauts face from radiation and microgravity. The show also examines the practicalities of life support, water, food, and the challenge of growing plants on the Moon, including offhand notes about regolith and the Moon’s extreme temperatures. The program then shifts to Earth, considering a potential super El Niño and its global implications for droughts, floods, and climate forecasting.

Artemis II and the Moon as a Frontier

The podcast opens with Libby Jackson, Head of Space at the Science Museum, describing Artemis II as a test bed for the Orion spacecraft and the huge SLS launcher. It is framed as a stepping stone toward Artemis III and eventual crewed lunar landings, with updated technology and substantial funding driving a renewed push to reach the Moon. The conversation emphasizes that the mission is as much about technology and geopolitics as it is about science, noting that a lunar base would change how nations view occupancy of space and control over space infrastructure.

"This is first and foremost a test flight. The first time that humans have been in this Orion spacecraft, the first time they've launched on top of the rocket. And it is about laying the groundwork so that future Artemis missions can move us towards landing on the Moon." - Libby Jackson

Lunar Habitats and Health: What It Takes to Live on the Moon

The discussion then shifts to health and habitat design. The host and expert discuss radiation exposure, including galactic cosmic radiation and solar radiation, and how astronauts will cope with no Earth's magnetic shield during lunar missions. They explore habitat concepts, such as living inside lava tubes or burying structures under regolith to shield inhabitants from radiation and temperature extremes. The segment also highlights the regolith itself as both a hazard and a resource, detailing its jagged, abrasive nature, electrostatic charging, and the need to prevent lunar dust from contaminating equipment and lungs.

"There's a lot of radiation coming out of our sun, but there's also galactic cosmic radiation. And we're not completely sure where galactic cosmic radiation comes from, but we think it's coming from stars exploding in other galaxies and sort of the bits of that explosion shooting through space." - Dr. Kelly Wienersmith

The conversation delves into regenerative life support for Moon bases, noting Moon soils are poor in carbon, nitrogen, and phosphorus, which are essential for growing crops. The speakers discuss potential strategies for sourcing these nutrients, including bringing waste stocks from Earth or leveraging polar ice for water and trace elements. The playful aside about Neil Armstrong’s bowel movements hints at the fascinating, if humorous, challenges of closed-loop resource cycles in extreme environments. The section stresses that while a research outpost is plausible, a full multi-generational settlement remains uncertain given current knowledge of long-term human health in low gravity and high radiation.

Turning to broader planetary ambitions, the podcast assesses whether humanity will settle another world. The guest underscores that Mars offers more of the essential elements needed for sustained settlement, but the longer travel times and higher exposure to radiation complicate mission design. The Moon remains a valuable proving ground for in-situ resource use and habitat development, providing a near-term testbed for technologies that could support deeper space outposts.

"If we're talking about a research station and people going out there for a couple of months at a time and then coming back, I think that could be totally doable. But a settlement where families live for generations—I'm not sure we know yet if we can live in an environment we did not evolve for." - Dr. Kelly Wienersmith

The episode closes with Roland Pease handing the mic to Tim Stockdale of ECMWF to discuss a potential super El Niño. The experts explain the mechanics: warming in the central Pacific, shifts in deep convection, and the winds that drive teleconnections across the globe. They describe how a stronger El Niño could alter weather patterns, creating droughts in some regions and floods in others, and how the tropical Pacific Ocean stores heat that can be released during such events. The forecast is presented with caution, noting substantial uncertainty due to winds and climate change, and the timing of the event's peak toward the end of the year is highlighted.

"The model forecast is suggesting that the temperatures will start warming now and really warm throughout our summer going into the autumn. And then usually if there's a large El Niño event, it will usually peak at the end of the year." - Tim Stockdale

The conversation emphasizes the broad impacts of El Niño on global weather and climate, including droughts, floods, and heatwaves, and the role of climate models in informing policy and disaster preparedness. The playful but informative tone leaves listeners with a sense of the interconnectedness of Earth system science and space exploration, anchored by expert voices across space, planetary science, and climate forecasting.